Samsung forum

Question

Horizontal lines on Samsung LCD TV LE55A966D1

by Knauande / February 4, 2014 1:34 AM PST

Hi,

I have a Samsung LE55A966D1WXXE from 2009 that have got horizontal lines on the screen.

They are black and is on every 5:th row. Mostly on the right side and fading out on the left side.

I have changed the caps on the power board and have disconnected and connected the flex cables from the board to the screen.

Do any of you have ant suggestion where I should check?

Thanks for your help
/Knauande

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All Answers

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Answer
As you are the TV tech.
by R. Proffitt Forum moderator / February 4, 2014 1:39 AM PST

I'd go back to the service manual and see what it suggests. My thought is to replace cables from main board up to the display and boards inbetween display and mainboard. If that doesn't clear it up, replace the mainboard.
Bob

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Root cause/ broken component?
by Knauande / February 4, 2014 1:54 AM PST

Hi Bob,

Thanks for your suggestions but I want to find the root cause, not swapping part after part until I find the faulty unit. I want to repair/replace the faulty part Happy

Once again, thanks for your suggestions and have a great day,
/Knauande

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Then back to the manual.
by R. Proffitt Forum moderator / February 4, 2014 1:58 AM PST

As a TV tech you know that swapping parts is how it's done today. Gone are the engineers with oscilloscopes and schematics. Also gone is board repair in most cases. I know die hard engineers that hate this change but they also know when to cut bait and run.

I wonder if you have the service manual. About half the TV techs try to go without. Some try to ask around for what part to change!
Bob

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Lines don't pass through white text
by Knauande / February 5, 2014 2:03 AM PST

Just want to add that the black lines doesn't pass trough white text.

And Yes, I'm one of those engineers that's doing fault finding on electronics and do all repairs by myself as a hobby Happy

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As there are no schematics.
by R. Proffitt Forum moderator / February 5, 2014 2:07 AM PST

We have to defer to the service manual (these are at www.samsungparts.com) on which board to change first.

I hear you as I did root cause analysis years ago with what would be a billion dollar lab today.
Bob

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No available service manuals
by Knauande / February 8, 2014 7:19 PM PST

Didn't find any service manuals on the web page.

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What country?
by R. Proffitt Forum moderator / February 9, 2014 2:48 AM PST
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